Lifting device for press-rolls of paper-making machinery.



in. 665,473. v, Patentd' Jan1 8, 19m; T. H. SAVERY. I v LIFTING DEVICE FOR PRESS ROLLS OF 'PAPER MAKING MACHINERY.

(Application filed July 25, 1900.)

(Pin Model.)

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NITED STATES PATENT Fries.

THOMAS H. SAVERY, or WILMINGTON, DELAWARE;

LIFTING DEVICE FOR PRESS-ROLES 0F PAPER-MAKING MACHINERY.

SEEOIFIGA TION forming part of Letters Patent No. 665,473, dated January 8, 1901.

Application filed July 25,1900.

To all whom it may concern;

Be it known that I, THOMAS H. SAvERY, a citizen of the United States, residing at Wilmington, county of New Castle, and State of Delaware, have invented certain new and useful Improvements in Lifting Devices for the Press-Rolls of Paper-Makin g Machinery,f ully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to certain improvements in lifting devices for the press-rolls of paper-making machines.

In paper-making machines as now usually constructed the upper or movable press-roll is journaled in a pair of swinging arms, each of said arms being pivoted to a housing. At each end of the roll a screw-rod is located, said rods being pivoted to the housings and connected to the swinging arms and having nuts controlled by hand-wheels, by which the screw-rods and the arms are raised and lowered. This mechanism is cumbersome. and slow in operation, owing to the weight of the rolls to be lifted.

It is the object of this invention to produce an improved lifting mechanism for press-rolls operating upon the hydraulic principle, said mechanism being neat, compact, efficient, and inexpensive and by which the rolls can be quickly raised and lowered.

With this and other objects in view the in vention consists in certain constructions and in certain parts, improvements, and combinations, as will be hereinafter fully described and then specifically pointed out in the claims hereunto appended.

In the accompanying drawings, forming a part of this specification, and in which like characters of reference indicate the same parts, Figure 1 isa side view of a pair of pressrolls with the improved lifting device attached thereto. Fig. 2 is a front view of the construction shown' in Fig. 1. Fig. 3 is a detail sectional elevation of the fluid-containing cylinder and parts immediately connected therewith, the view also illustrating the connection between the cylinder and the housing.

Referring to the drawings, 1 and 2 indicate the side frames of the machine, which may be of any suitable construction. Each side frame is provided with a bearing 3, in which is j our- Serial No. 24,766. (No model.)

naled the lower or stationary press-roll 4. Mounted on each side of the frame is a housing 5, and to each housing is pivoted an arm 6, the pivotal point of said arms being indicated at 7. Each arm is provided with a bearing 8, and in these bearings is journaled the upper or movable press-roll 9.

The lifting device for the upper press-roll may be widely varied in construction. Preferably, however, it embodies a tube 10, said tube being secured to a base 11 by means of screw-threads or in any other suitable manner. This tube and base form a cylinder, and two such cylinders will be preferably employed, one for each end of the roll; but since these cylinders and their connections are counterparts in all respects a description of one will serve for both. Each cylinder is preferably movably connected to the housing on the side on which the cylinder is located. This movable connection will preferably be a pivotal or rocking connection and may be formed in various ways. In the construction shown the base 11 of each cylinderis provided with a convex projection 12, said projection engaging a concave recess 13 in the upper end of the housing 5, which is to support the cylinder. The cylinder 10 has located in it a tube 14., said tube having secured to its top in any suitable manner, as by screw-threads, a casting 15, said tube and casting forminga ram, as will hereinafter appear. The lower end of the tube 14. is closed in any suitable manner, as by a screw-plug 16, which has an opening therethrough closed by a valve 17, the stem of the valve extending slightlyabove the top of the plug. f A spring 18 holds the valve normally closed, said spring bearing against the bottom of the valve and against a suitable bonnet 19, which is screwed into or otherwise secured to the plug. A suitable washer or washers surround the lower end of the plug, making a tight joint between the lower end of the tube 14. and the chamber 20 below the lower end of the plug. The casting 15 is preferably hollow, so as to form a fluidcontaining chamber 21, a suitable filling-orifice closed by a screw-plug 22 being preferably provided. The opening in the chamber in the casting 15 communicates with the opening in the tube 14, so that the opening in said tube in reality forms a part of said chamber 21. If desired, and as shown, the tube 14 may be counterbored at each end, thus making the opening at the ends somewhat larger than the opening in the center, and working in the central part of the opening is a pumppiston 23, said piston having a longitudinal opening 2t, which communicates with the chamber 21 by means of ducts or passages 25. The lower end of the openim 21 is closed bya valve 26, said valve being held in position by means of a suitable bonnet 27. Between the valve 26 and the top of the screw-plug 16 is a chamber 28.

The casting 15 is preferably formed with an interior projection 29, in which the upper end of the piston works, and any suitable means may be employed for operating the piston. Preferably, however, the upper end of the piston is provided with a rack 30, said rack being in mesh with a toothed segment 31, which is fast on a short shaft 32, suitably journaled in the casting. The outer end of the shaft has secured thereto a handle 33, by which the shaft may be rocked.

Suitable lifting connections are provided by which each of the rams may lift the roll. \Vhile these connections may be varied widely in character, they are shown as consisting of bars 3 1, said bars being preferably pivoted at 35 to the head of the ram and at 36 to bosses or projections 37, formed on the arms (5. If desired, suitable guides 38 may be provided, which are seen red to the base 11 of the cylinder, which serve to control the movement of the bars.

\Vith the construction as described when it is desired to raise the roll an operator on each side of the machine will seize the handles 33 and operate the pistons 23. On the upstroke of each piston the water or other fluid in the chambers 21 will pass through the openings 25 into the perforations 24 and around the valves 26 into the chambers 28. On the downstroke of the pistons the water in the chambers 28 will be forced around the valves 17, said valves being moved away from their seats against the stress of the springs 18 and into the chambers 20. As the water is forced into these chambers under high pressure the tubes 14 and the castings 15, connected thereto, which parts form the rams, will be forced upward. As the ram at each end of the machine moves upward the roll is carried up with them. Inasmuch, furthermore, as each fluid-containing cylinder is pivoted to its housing and the connecting-rods by which the rams lift the rolls are also pivoted, proper alinement will be maintained between all parts of the construction at all times.

\Vhen it is desired to allow the roll to descend, the operatorat each end of the machine will force the pistons down until the bonnets strike the upper projecting ends of the stems of the valves 17. This will force these valves from their seats and allow the fluid to pass from the chambers 20 back into the chambers 28 and from these chambers through the openings 24 and the ducts 25 into the upper chambers 21. Inasmuch as the opening of the valve 17 can be absolutely controlled, so as to allow only a very small quantity of fluid to escape from around it, it will be seen that the descent of the roll can be absolutely controlled or checked at any point.

While two cylinders and their connected operating parts are shown, one for lifting each end of the roll, it will be understood that constructions within the invention may be employed in which a single cylinder through proper connections may be caused to lift both ends of the roll. Furthermore, the details of construction by which the invention is carried into effect may be varied widely. It is to be understood, therefore, that the invention is not to be limited to the exact details of construction shown and described.

What is claimed is 1. In a paper-making machine, the combination with a press-roll, of a movable fluidcontaining cylinder, a ram in the cylinder, a pump mechanism in the cylinder, connections whereby the ram lifts the roll, and means for operating the pump mechanism, substantially as described.

2. In a paper-making machine, the combination with a press-roll, of a pivoted fluidcontaining cylinder, a ram in the cylinder, a pump mechanism in the cylinder, connections whereby the ram lifts the roll, and means for operating the pump mechanism, substantially as described.

3. In a paper-making machine, the combi nation with a press-roll, of swinging arms in which the same is mounted, a movable fluidcontaining cylinder, a ram in the cylinder, a pump mechanism in the cylinder, means for operating the pump mechanism, and suitable lifting connections, substantially as described.

4. In a paper-making machine, the combination with a press-roll, of a housing, a pair of arms pivoted to the housing and in which the press-roll is mounted, a fluid-containing cylinder pivoted on the housing,a ram in the cylinder, and lifting connections between the ram and one of the arms, substantially as described.

5. In a paper-making machine, the combination with a press-roll, of a housing, a pair of arms pivoted to the housing and in which the press-roll is mounted, a fluid-containing cylinder pivoted on the housing, a ram in the cylinder, and pivoted lifting connections between the ram and one of the arms, substantially as described. I

6. In a paper-making machine, the combination with a press-roll, of a housing, a pair of arms pivoted to the housing and in which the press-roll is mounted, a fluid-containing cylinder pivoted on the housing, a ram in the cylinder, and a pair of lifting-rods, said rods being pivoted to the ram and to one of the roll-carrying arms,substantially as described.

7. In a paper-making machine, the combination with a press-roll, of a housing, a pair of arms pivoted to the housing and in which the press-roll is mounted, a fluid-containing cylinder pivoted on the housing, a ram in the cylinder, a pump mechanism in the cylinder, lifting connections between the ram and one of the arms, and means for operating the pump mechanism, substantially as described.

8. In a paper-making machine, the combination with a press-roll, of a housing, a pair of arms pivoted to the housing and in which the press-roll is mounted, a fluid-containing cylinder pivoted on the housing, a ram in the cylinder, a pump mechanism in the cylinder, pivoted lifting connections between the ram and one of the arms, and means for operating the pump mechanism, substantially as described.

9. In a paper-making machine, the combination with a press-roll, of a housing, a pair of arms pivoted to the housing and in which the press-roll is mounted, a fluid-containing cylinder pivoted on the housing, a ram in the cylinder, a pump mechanism in the cylinder,

a pair of lifting-rods, said rods being pivoted to the ram and to one of the roll-carrying arms, and means for operating the pump mechanism, substantially as described.

10. Inapaper-making machine, the combination with a press-roll, of a pair of arms in which the roll is carried, each of said arms being pivoted to a housing, a pair of fluid containing cylinders, each of said cylinders being also pivoted to the housing, a ram in each cylinder, a pump mechanism in each cylinder, a pair of connectingrods extending from each arm to each ram, said rods being pivoted to the arms and to the rams, and means for operating the pump mechanism, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

THOMAS H. SAVERY.

Witnesses:

VINCENT G. HAZARD, WILLIAM H. SAVERY. 

